Citazione Stile APA (7a Edizione)

Abrams, S., & Rein, D. P. B. (1982). Spectrum 1: A communicative course in English. Regents Publishing Company.

Citazione stile Chigago Style (17a edizione)

Abrams, Sharon, e David P. Byrd Rein. Spectrum 1: A Communicative Course in English. New York: Regents Publishing Company, 1982.

Citatione MLA (9a ed.)

Abrams, Sharon, e David P. Byrd Rein. Spectrum 1: A Communicative Course in English. Regents Publishing Company, 1982.